[PATCH blktests] nvme/039: drain udev events before passthru error injection

[John Garry]

On 30/06/2026 12:29, John Garry wrote:
> + linux-nvme

Hi Shin'ichiro,

Can you kindly picking up this change, below?

Thanks!

> 
> On 30/06/2026 11:19, Mateusz Nowicki wrote:
>> From: Mateusz Nowicki <Mateusz.Nowicki at posteo.net>
>>
>> When run repeatedly, nvme/039 fails intermittently with a regular block
>> read error instead of the expected passthru line, e.g.:
>>
>>    nvme0n1: Read(0x2) @ LBA 0, 8 blocks, Invalid Command Opcode (sct 
>> 0x0 / sc 0x1) DNR
> 
> This is not the error which I was seeing, however this change seems to 
> make the test pass reliably for the me. I have not debugged why the test 
> was intermittently failing for me.
> 
> Please also note that I did trigger a kernel warn previously for this 
> test and I posted a proposed fix in:
> 
> https://lore.kernel.org/linux-nvme/20260630102717.2671475-1- 
> john.g.garry at oracle.com/T/#u
> 
> thanks
> 
>>
>> inject_write_fault_on_write() writes LBA 0 of the whole-disk device,
>> whose release emits a change uevent that makes udev run blkid, reading
>> LBA 0 asynchronously. The following passthru injection arms a one-shot
>> fault (times=1); if the stray blkid read races in first it consumes the
>> fault and is logged via nvme_log_error() (no cdw fields), so the expected
>> passthru line is never emitted and the test fails.
>>
>> Drain the pending uevent with udevadm settle before the passthru section.
>>
>> Signed-off-by: Mateusz Nowicki <Mateusz.Nowicki at posteo.net>
>> ---
>>   tests/nvme/039 | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/tests/nvme/039 b/tests/nvme/039
>> index 7ca48ec..8c70c5c 100755
>> --- a/tests/nvme/039
>> +++ b/tests/nvme/039
>> @@ -206,6 +206,8 @@ test_device() {
>>       inject_invalid_status_on_read "${ns_dev}"
>>       inject_write_fault_on_write "${ns_dev}"
>> +    udevadm settle
>> +
>>       if [ -e "$TEST_DEV_SYSFS/passthru_err_log_enabled" ]; then
>>           _nvme_passthru_logging_setup "${ns_dev}" "${ctrl_dev}"
>